How to get the session for WeChat applet login? (detailed)

The content of this article is about how to obtain the session for WeChat applet login? (Details), it has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Obtain the session for WeChat applet login. The whole process is as follows:

The first step: The applet obtains the js_code to be transmitted to the server.

App({
  onLaunch: function() {
    wx.login({
      success: function(res) {
        if (res.code) {
          //TODO
        } else {
          console.log('获取用户登录态失败！' + res.errMsg)
        }
      }
    });
  }
})

Step 2: The server receives js_code, then calls the WeChat interface to verify and obtains session_key

Interface calling address:
https://api .weixin.qq.com/sns...

Request parameters:

Parameter Required Description
appid Yes The unique identifier of the mini program
secret Yes The app secret of the mini program
js_code Yes Code obtained when logging in
grant_type Yes Fill in authorization_code

Return parameters:

Parameter Description
openid User unique identification
session_key Session key
unionid The user’s unique identifier on the open platform. This field will only be returned if certain conditions are met. For details, please refer to the UnionID mechanism description

appid (the unique identifier of the mini program) and secret (the app secret of the mini program) are obtained as follows:

wx.checkSession
Check whether the current user login status is valid

wx.checkSession({
  success: function(){
    //session 未过期，并且在本生命周期一直有效
  },
  fail: function(){
    //登录态过期
    wx.login() //重新登录
    ....
  }
})

The above is the detailed content of How to get the session for WeChat applet login? (detailed). For more information, please follow other related articles on the PHP Chinese website!